Method of manufacturing non-curling paper adhesive on one side and product.



Patented Aug. 3, 1915.

M. KNAPPSTEIN.

APPLICATION FILED 050.27. 1913.

METHOD OF MANUFACTURING NON-CURLING PAPER ADHESIVE ON ONE SIDE AND PRODUCT.

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MAX KNAPPSTEIN, 0F B REMEN, GERMANY.

METHOD OF MANUFACTURING NON-CURLING PAPER ADHESIVE ON ONE SIDE AND PRODUCT.

Specification of Letters Patent.

Patented Aug. 3, 1915.

Application filed December 27, 1913. Serial No. 808,957.

To all whom it may concern:

Be it known that 1, MAX KNAPPSTEIN, a subject of the German Emperor, and resident of Bremen, in the German Empire, have invented an Improved and Novel Method of Manufacturing Non-Curling Paper Adhesive on One Side and Product, of which the following is a specification.

The object of the method forming the subject-matter of the present invention consists in improving the previous method of manufacturing non-curling paper adhesive on one side, the known method being characterized by the feature that the coating of the adhesive substance is broken in straight lines extending over the whole area of the paper and crossing each other. The coating in question is subdivided by this means into small rectangles or paralellograms, it is true, obviating the tendency .of the paper to curl, but at the same time they increase the tendency of the paper to tear, since each of said straight rupture lines is liable to act as a tearing line, similar to the tearing lines produced in still flat sheets by first folding and then unfolding these latter. The paper treated in the old way tears easily at its edges or rims during the production of the ruptured lines, so that much waste results and one is compelled to employ comparatively hard andfvery tear-proof and consequently expensive paper in cases where a soft and cheap kind of paper might be more advantageous, for instance in the case of postage-stamps which, if made of such paper, could with far more difficulty be loosened ofl', freed of its stamp impression, and re-used.

According to my improved method, the drawbacks in question shall be done away with by rupturing the adhesive paper surface in short lines of different directions. These lines are thus no long rupture lines of the same direction which extend each over the whole length or breadth of the paper and there is no subdivision of the paper into rectangular or quadrangular parts, but the subdivision is such that the bordering lines of each of the paper parts in question are short, and, in fact, they may be curved instead of being straight. The chief point is obviating the arising of long straight rupture lines which extend across the whole area of the paper.

L plate.

The method is preferably carried out in the manner that the paper adhesive upon one side is pressed between a roller or plate consisting of a hard material, for instance a metal, and having an engraving representing cones, pyramids, or irregular bodies or surfaces, and an elastic counter-roller or The engraving of the hard plate or roller may be embossed or incised. The counter-plate or roller may be formed of india-rubber, paper, cotton, or another elastic material.

In order to make my invention more clear, I refer to the accompanying drawing, in whicha Figure 1 shows in plan and in two sections lying at right angles to each other a metal plate having an engraving of circles, the section lefthand from the plan showing the engraving incised, and the section below the plan, in line A--B of it, showing the engraving embossed; Fig. 2 is a representation similar to Fig. l, the engraving being composed of. hexagons; the section figure below the plan is taken in line CD of this latter; Fig. 3 shows a piece of paper pressed with the plate of Fig. 1; Fig. 4 shows a similar piece pressed with the plate of Fig. 2; Fig. 5 is another similar view which is more fully treated hereinafter; and Fig. 6 is a diagrammatical representation of a plant in which two lengths of paper may simultaneously be treated in the manner in question.

If the paper adhesive upon one side is pressed with the incised engraving either upon the adhesive surface or upon the other one, the bordering lines of the engraved parts, 2'. e of the circles or of the hexagons or the like, are impressed into it, whereas the incised cavities themselves are impressed either not at all or but very little. The adhesive layer is in this way ruptured into short lines of different directions representing, for instance, circles or .hexagons, as shown. The thus treated paper ofiers then the appearance represented in Figs. 3 and 4c, 4

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If the paper is pressed, either upon its adhesive or upon its non-adhesive side, with the embossed engraving, the somewhat truncated heads of thecircular or hexagonal or otherwise shaped cones press upon the respective side of the paper, and ruptures radiating forth from the respective points are produced, as shown in Fig. 5. The thus treated paper is sufliciently protected from curling, if it is. used in comparatively large pieces, whereas if it shall be employed in.

- termined by the tearing strength of the to form a loop 11. where itis under the pull paper.

The plant represented diagrammatically in Fig. 6 is intended for treating two lengths of paper at a time. a is anengraved roller which is rotated in the direction of the arrow and is arranged between two elastic rollers b and e. The rollers d, e, and f, are

smoothing rollers, which, as such, have each g and i are the paper a smooth surface. supply cylinders. The paper from g is passed through between the rollers a and c, and that from i is passed through between the roller a and 0, to be subjected to pressure between the respective two rollers and provided with the rupture lines in question. The treated paper from g is so conducted as of an appropriately heavy bar, and the other paper length is so conducted as to form a loop m where there is a similar pull bar, as shown. The two paper lengths finally pass through between the set of smoothing rollers 03 e f whence they go to wrapping up cylinders h and k, as shown.

.The loops m n serve also to make up for small differences in thespeed of the roller sets a b c and (Z c f, the loops becoming automatically correspondingly longer or shorter,

as the case may be.

Having now described my invention, what I desire to secure by a patent of the United States is 1. The 'method of manufacturing noncurling paper adhesive on one side by rupturing, consisting in rupturing the adhesive coating in short lines of various directions, as set forth.

2. The method of manufacturing noncurling paper adhesive on one side by rupturing, consisting in rupturing the adhesive layer with a plurality of short lines of changing directions, as set forth.

3. The method of manufacturing noncurling paper adhesive on one side by rupturing, consisting in rupturing the adhesive coating of the paper from any of the two sides of the same in short lines of changing directions.

4. The method of manufacturing noncurling paper adhesive on. one side by rupturing, consisting in rupturing the adhesive layer from any of the two surfaces of the paper with a plurality of short lines of different directions.

-5. The method of manufacturing'n0ncurling paper adhesive on one side by rupturing, consisting in rupturing the adhesive layer fromone or the other surface of the paper with short independently extending lines each terminating within the edges of the paper.

6. As a new article of manufacture: noncurling paper adhesive on one side and having its adhesive coating ruptured into short MAX KNAPPSTEIN.

Witnesses WILHELM STRUP, FREDERICK HOYERMANN. 

